Add DLSequence, DLSet for internal use

- improve sorting of sets

1 files changed, 91 insertions, 0 deletions

diff --git a/crypto/src/asn1/DLSet.cs b/crypto/src/asn1/DLSet.cs
new file mode 100644
index 000000000..0605a0167
--- /dev/null
+++ b/crypto/src/asn1/DLSet.cs
@@ -0,0 +1,91 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1
+{
+    internal class DLSet
+        : DerSet
+    {
+        internal static new readonly DLSet Empty = new DLSet();
+
+        internal static new DLSet FromVector(Asn1EncodableVector elementVector)
+        {
+            return elementVector.Count < 1 ? Empty : new DLSet(elementVector);
+        }
+
+        /**
+         * create an empty set
+         */
+        internal DLSet()
+            : base()
+        {
+        }
+
+        /**
+         * create a set containing one object
+         */
+        internal DLSet(Asn1Encodable element)
+            : base(element)
+        {
+        }
+
+        internal DLSet(params Asn1Encodable[] elements)
+            : base(elements, false)
+        {
+        }
+
+        /**
+         * create a set containing a vector of objects.
+         */
+        internal DLSet(Asn1EncodableVector elementVector)
+            : base(elementVector, false)
+        {
+        }
+
+        internal DLSet(bool isSorted, Asn1Encodable[] elements)
+            : base(isSorted, elements)
+        {
+        }
+
+        internal override int EncodedLength(bool withID)
+        {
+            throw Platform.CreateNotImplementedException("DLSet.EncodedLength");
+        }
+
+        internal override void Encode(Asn1OutputStream asn1Out, bool withID)
+        {
+            if (asn1Out.IsDer)
+            {
+                base.Encode(asn1Out, withID);
+                return;
+            }
+
+            if (Count < 1)
+            {
+                asn1Out.WriteEncodingDL(withID, Asn1Tags.Constructed | Asn1Tags.Set, Asn1OctetString.EmptyOctets);
+                return;
+            }
+
+            // TODO Intermediate buffer could be avoided if we could calculate expected length
+            MemoryStream bOut = new MemoryStream();
+            // TODO Once DLOutputStream exists, this should create one
+            Asn1OutputStream dOut = Asn1OutputStream.Create(bOut);
+            dOut.WriteElements(elements);
+            dOut.FlushInternal();
+
+#if PORTABLE
+            byte[] bytes = bOut.ToArray();
+            int length = bytes.Length;
+#else
+            byte[] bytes = bOut.GetBuffer();
+            int length = (int)bOut.Position;
+#endif
+
+            asn1Out.WriteEncodingDL(withID, Asn1Tags.Constructed | Asn1Tags.Set, bytes, 0, length);
+
+            Platform.Dispose(dOut);
+        }
+    }
+}